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The girl is recovering at The Children's Hospital at Westmead where she has undergone surgery to reattach part of her nose and has received treatment for an injury under her eye.

The dog has been seized by police.

Police have launched a joint investigation with Holroyd City Council and it's not yet known what will happen to the dog.

Officers said they believed some food around the animal may have contributed to the attack.

The attack has prompted the RSPCA to issue a reminder about the dangers of leaving children unsupervised with dogs.

"It is really important that children are never left unsupervised with a dog, it doesn't matter how trustworthy or laid back or relaxed that dog is or how friendly they seem," the RSPCA's Kelly Walton said.

The young girl remains in a stable condition in hospital but will likely require further cosmetic surgery to treat her physical scars.